Valve diagnostic apparatus and method

Details Valve diagnostic apparatus and method Valve diagnostic apparatus and method

1991-01-30

1993-12-21

Harvey, Jack B.

Boots, shoes, and leggings

364552, 73168, G06F 1520

Patent

active

052726479

ABSTRACT:
A valve test unit (100) for attachment to a value (12) having a fluidly operated stem actuator (20a) responsive to a positioner device (24a). The unit includes a first input port (102) connectable to a source (104) of fluid pressure, a second input port (106) connectable to a source (108) of electrical power, a first output port (110) fluidly connected to the first input port, for delivering a controlled fluid pressure from the unit, and a second output port (114) electrically connected to the second input port, for delivering a controlled electrical signal from the unit. Test programs (118) are provided for converting fluid pressure, at the first input port, into a controlled, time dependent fluid pressure at the first output port and converting electrical power at the second input port into a controlled, time dependent electrical signal at the second output port. The test unit thus has the capability to control a valve electrically, with either a program voltage or current versus time, or to drive the valve by fluid pressure, e.g., pneumatically. The desired driving function is programmed into the computer associated with the base unit. In effect, the test unit functions on a temporary basis, as a valve positioner for test purposes.

REFERENCES:
patent: 4570903 (1986-02-01), Crass
patent: 4976144 (1990-12-01), Fitzgerald
patent: 5109692 (1992-05-01), Fitzgerald
"Presentation to NOMIS Conference on Air Operated Valve Program and Diagnostic Testing"-Paper by John H. Hayes, Toledo Edison, Jul. 17, 1989.

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